[viviena]

Sony PRS-x50: an excellent ereader, very stable.

Sony PRS-x50 & PRS+: an awesome ereader.

Sony PRS-T1: by all accounts, more features than the x50 but its new OS means that the user experience can be a bit glitchy. If deciding between a x50 and a T1 though, I'd get this just because it would be easier to find, I don't think there are any more x50s on sale where I live.

Kobo WiFi: why bother?

Kobo Touch: merely a good ereader and glitchy for some, but its implementation of some features gives it some advantages over its competition, in this case Sony. Marketed very heavily as a 'social' ereader.

What I like about my 350 and the Sony experience: collections, library view. PRS+!!! Stability. Annotations. How well it manages side-loaded EPUBs. The Oxford Dictionary of English. Margin cut & PDF reflow (though I hear viewing PDF on the T1 is bad). How well integrated Sonys are with Calibre.

What I like about the Kobo Touch: feels nice. Extensive page style options all presented in a nice, easy to use UI without having to fiddle with code, e.g. fonts, margins, line spacing. (The T1 is supposed to have more style options than the x50, but the KT's is seriously very thorough.) The UI (pre-1.9.14 at least) is nicer. Integration with KoboBooks. The social options (looking forward to Pulse). Responsive dev team. Can't say I've had any groundbreaking bugs that other KT users have had too, though it seems to depend on luck some times.